:root {
  color-scheme: light;
  --bg: #f5f8fd;
  --surface: #ffffff;
  --text: #10243f;
  --muted: #64748b;
  --primary: #0b63ce;
  --accent: #22d3ee;
  --line: rgba(15, 41, 77, 0.1);
  --shadow: 0 24px 70px rgba(12, 38, 79, 0.14);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--text); background: var(--bg); line-height: 1.7; }
a { color: inherit; text-decoration: none; }
.wrap { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.hero { position: relative; min-height: 840px; overflow: hidden; color: #fff; background: radial-gradient(circle at 16% 18%, rgba(34, 211, 238, 0.42), transparent 30%), radial-gradient(circle at 82% 20%, rgba(105, 160, 255, 0.38), transparent 28%), linear-gradient(135deg, #04122a 0%, #092b5d 48%, #0b5fc8 100%); }
.hero::after { content: ""; position: absolute; inset: auto -10% -45% -10%; height: 420px; background: linear-gradient(180deg, rgba(245,248,253,0), #f5f8fd 32%); transform: rotate(-4deg); transform-origin: left top; }
.nav { position: relative; z-index: 5; width: min(1240px, calc(100% - 40px)); margin: 0 auto; padding: 22px 0; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 14px; }
.brand > span { width: 58px; height: 58px; display: grid; place-items: center; border-radius: 18px; color: #fff; background: linear-gradient(135deg, #4fc3ff, #064fc8); border: 2px solid rgba(255,255,255,.78); font-size: 30px; font-weight: 900; box-shadow: 0 18px 42px rgba(34, 211, 238, 0.34); }
.brand strong { display: grid; padding: 6px 10px; border-radius: 8px; color: #fff; background: linear-gradient(90deg, rgba(21,91,230,.92), rgba(5,50,145,.46)); font-size: 21px; line-height: 1.05; letter-spacing: 1px; text-shadow: 0 2px 10px rgba(0,0,0,.28); }
.brand small { margin-top: 5px; color: #dff8ff; font-size: 12px; font-weight: 900; letter-spacing: 1.7px; text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 10px; color: #fff; font-size: 16px; font-weight: 800; }
.nav-links a { padding: 8px 12px; border-radius: 4px; background: rgba(0, 94, 230, .72); box-shadow: 0 10px 24px rgba(0, 46, 120, .18); transition: color .2s ease, background .2s ease, transform .2s ease; }
.nav-links a:hover { color: #fff; background: rgba(34, 211, 238, .34); transform: translateY(-1px); }
.nav-toggle { display: none; border: 0; width: 44px; height: 44px; border-radius: 12px; color: #fff; background: rgba(255,255,255,.14); font-size: 22px; cursor: pointer; }
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.05fr .95fr; gap: 58px; align-items: center; padding: 100px 0 180px; }
.hero-badge { display: inline-flex; align-items: center; gap: 10px; margin: 0 0 22px; padding: 8px 16px; border: 1px solid rgba(255,255,255,.25); border-radius: 999px; color: #dff9ff; background: rgba(255,255,255,.11); backdrop-filter: blur(12px); font-size: 15px; font-weight: 800; }
.hero-badge i { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 18px var(--accent); }
.brand-hero { margin: 0 0 26px; }
.brand-hero span { display: block; font-size: clamp(78px, 11.5vw, 150px); line-height: .9; font-weight: 950; letter-spacing: -5px; color: #fff; text-shadow: 0 16px 36px rgba(0,0,0,.36), 0 0 46px rgba(34,211,238,.36); }
.brand-hero strong { display: inline-block; margin-top: 16px; padding: 9px 18px; border: 1px solid rgba(255,255,255,.6); border-radius: 999px; color: #062657; background: linear-gradient(135deg, #ffffff, #9decff); font-size: clamp(18px, 2.2vw, 30px); letter-spacing: 7px; box-shadow: 0 20px 54px rgba(34,211,238,.24); }
.lead { max-width: 690px; margin: 28px 0 0; color: rgba(255,255,255,.78); font-size: 18px; }
.highlight-lead { max-width: 800px; padding: 28px 32px; border: 1px solid rgba(255,255,255,.24); border-left: 7px solid var(--accent); border-radius: 26px; background: linear-gradient(135deg, rgba(255,255,255,.2), rgba(255,255,255,.08)); box-shadow: 0 26px 74px rgba(0,0,0,.2); font-size: 22px; font-weight: 850; color: #fff; backdrop-filter: blur(18px); }
.actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 36px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 14px 24px; border-radius: 999px; font-weight: 900; letter-spacing: .3px; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn.primary { color: #fff; background: linear-gradient(135deg, var(--primary), #129bd8); box-shadow: 0 18px 44px rgba(0, 112, 220, .28); }
.hero .btn.primary { color: #082246; background: linear-gradient(135deg, #fff, #8ceeff); }
.btn.ghost { color: #fff; border: 1px solid rgba(255,255,255,.24); background: rgba(255,255,255,.1); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.hero-tags span { padding: 7px 12px; border-radius: 999px; color: #dff9ff; background: rgba(255,255,255,.12); font-size: 13px; }
.hero-visual { position: relative; min-height: 560px; }
.digital-twin-stage { position: relative; min-height: 560px; perspective: 980px; }
.terrain-grid { position: absolute; inset: 92px -10px 34px 22px; border: 1px solid rgba(157,236,255,.28); border-radius: 36px; background: radial-gradient(circle at 20% 18%, rgba(157,236,255,.18), transparent 22%), linear-gradient(135deg, rgba(255,255,255,.14), rgba(255,255,255,.04)), repeating-linear-gradient(90deg, transparent 0 38px, rgba(157,236,255,.18) 39px 40px), repeating-linear-gradient(0deg, transparent 0 38px, rgba(157,236,255,.14) 39px 40px); transform: rotateX(62deg) rotateZ(-17deg); box-shadow: 0 46px 120px rgba(0,0,0,.30), inset 0 0 60px rgba(34,211,238,.08); overflow: hidden; }
.terrain-grid::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent, rgba(34,211,238,.24), transparent); transform: translateX(-100%); animation: scanLine 4.8s ease-in-out infinite; }
.city-cluster { position: absolute; left: 110px; right: 54px; bottom: 112px; z-index: 2; display: grid; grid-template-columns: repeat(12, 1fr); gap: 9px; align-items: end; transform: perspective(620px) rotateX(54deg) rotateZ(-17deg); transform-origin: center bottom; }
.city-cluster i { display: block; min-height: 94px; border-radius: 10px 10px 3px 3px; background: linear-gradient(180deg, #c9fbff 0%, #42bbff 44%, #0b63ce 100%); box-shadow: 0 16px 34px rgba(0,0,0,.26), 0 0 28px rgba(34,211,238,.18); opacity: .95; }
.city-cluster i:nth-child(2) { min-height: 72px; }
.city-cluster i:nth-child(3) { min-height: 132px; }
.city-cluster i:nth-child(4) { min-height: 84px; }
.city-cluster i:nth-child(5) { min-height: 120px; }
.city-cluster i:nth-child(6) { min-height: 158px; }
.city-cluster i:nth-child(7) { min-height: 108px; }
.city-cluster i:nth-child(8) { min-height: 136px; }
.city-cluster i:nth-child(9) { min-height: 178px; }
.city-cluster i:nth-child(10) { min-height: 98px; }
.city-cluster i:nth-child(11) { min-height: 146px; }
.city-cluster i:nth-child(12) { min-height: 206px; }
.scan-ring { position: absolute; z-index: 1; border: 1px solid rgba(157,236,255,.34); border-radius: 50%; transform: rotateX(66deg) rotateZ(-18deg); box-shadow: 0 0 38px rgba(34,211,238,.18); }
.ring-one { width: 360px; height: 170px; left: 122px; bottom: 170px; animation: pulseRing 3.8s ease-in-out infinite; }
.ring-two { width: 520px; height: 250px; left: 52px; bottom: 116px; opacity: .55; animation: pulseRing 3.8s ease-in-out infinite .8s; }
.uav-chip { position: absolute; right: 78px; top: 128px; z-index: 4; width: 158px; height: 86px; display: grid; place-items: center; border-radius: 999px; color: #083160; background: linear-gradient(135deg, #ffffff, #a9f5ff); font-size: 20px; font-weight: 950; box-shadow: 0 28px 80px rgba(34,211,238,.34); animation: float 4s ease-in-out infinite; }
.uav-chip span { display: block; color: #0b63ce; font-size: 12px; letter-spacing: 1px; }
.data-card { position: absolute; z-index: 5; border: 1px solid rgba(157,236,255,.28); border-radius: 26px; background: linear-gradient(135deg, rgba(8,35,78,.78), rgba(9,63,131,.56)); backdrop-filter: blur(20px); box-shadow: 0 24px 70px rgba(0,0,0,.28); }
.data-card small { display: block; color: #9decff; letter-spacing: 3px; font-weight: 950; }
.data-card strong { display: block; margin-top: 8px; color: #fff; line-height: 1.15; }
.data-card span { display: block; margin-top: 12px; color: rgba(223,248,255,.72); font-size: 14px; }
.card-top { top: 42px; left: 56px; padding: 26px 28px; min-width: 260px; }
.card-top strong { font-size: 28px; }
.card-main { right: 4px; bottom: 56px; padding: 30px 32px; min-width: 330px; background: linear-gradient(135deg, rgba(6,37,88,.92), rgba(8,73,150,.74)); }
.card-main strong { font-size: 36px; }
.card-mini { left: 46px; bottom: 40px; padding: 20px 22px; min-width: 220px; }
.card-mini strong { font-size: 22px; }
@keyframes scanLine { 0%, 100% { transform: translateX(-110%); opacity: 0; } 18%, 70% { opacity: 1; } 82% { transform: translateX(110%); opacity: 0; } }
@keyframes pulseRing { 0%, 100% { opacity: .34; transform: rotateX(66deg) rotateZ(-18deg) scale(.96); } 50% { opacity: .8; transform: rotateX(66deg) rotateZ(-18deg) scale(1.04); } }
.stats { position: relative; z-index: 3; margin-top: -82px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stats article, .cards article, .case-card, .timeline article, .asset-list div, .contact-card, .solution-panel { border: 1px solid var(--line); border-radius: 28px; background: rgba(255,255,255,.92); box-shadow: var(--shadow); }
.stats article { padding: 28px; background: linear-gradient(180deg, #fff, #f7fbff); }
.stats strong { display: block; color: var(--primary); font-size: 26px; }
.stats span, .title p, .cards p, .case-card p, .case-card li, .timeline p, .asset-copy p, .asset-list span, .checks, .contact p { color: var(--muted); }
.section { padding-top: 124px; }
.title { max-width: 860px; margin: 0 auto 50px; text-align: center; }
.eyebrow { margin: 0 0 12px; color: var(--primary); font-weight: 900; letter-spacing: 2px; text-transform: uppercase; }
h2 { margin: 0 0 16px; font-size: clamp(32px, 4vw, 48px); line-height: 1.18; letter-spacing: -1.2px; }
h3 { margin: 16px 0 10px; font-size: 22px; }
.cards { display: grid; gap: 22px; }
.four { grid-template-columns: repeat(4, 1fr); }
.cards article { padding: 30px; transition: transform .22s ease, border-color .22s ease; }
.cards article:hover { transform: translateY(-8px); border-color: rgba(34, 211, 238, .45); }
.cards b, .timeline b { color: var(--accent); letter-spacing: 2px; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-grid-two { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 1060px; margin: 0 auto; gap: 30px; }
.case-card { overflow: hidden; transition: transform .24s ease, border-color .24s ease, box-shadow .24s ease; background: linear-gradient(180deg, #fff, #f8fbff); }
.case-card:hover { transform: translateY(-10px); border-color: rgba(34, 211, 238, .52); box-shadow: 0 32px 90px rgba(10, 49, 97, .2); }
.case-image { height: 330px; overflow: hidden; background: #0b2448; position: relative; }
.case-image img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform .42s ease, filter .42s ease; }
.case-image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(4,18,42,0) 48%, rgba(4,18,42,.42)); pointer-events: none; }
.case-card:hover .case-image img { transform: scale(1.045); filter: saturate(1.08) contrast(1.04); }
.case-grid-two .case-card h3 { font-size: 25px; }
.case-card h3, .case-card p, .case-card ul { padding-left: 32px; padding-right: 32px; }
.case-card ul { margin: 0 0 30px; }
.timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.timeline article { padding: 28px; }
.assets { display: grid; grid-template-columns: .9fr 1.1fr; gap: 44px; align-items: center; }
.asset-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.asset-list div { padding: 24px; }
.asset-list strong, .asset-list span { display: block; }
.asset-list strong { margin-bottom: 8px; color: var(--primary); font-size: 20px; }
.contact { margin-top: 112px; margin-bottom: 90px; padding: 52px; display: grid; grid-template-columns: 1fr .88fr; gap: 34px; align-items: center; border-radius: 34px; color: #fff; background: linear-gradient(135deg, #071e3e, #0b63ce); box-shadow: var(--shadow); }
.contact h2, .contact .eyebrow, .contact p { color: #fff; }
.contact p { opacity: .82; }
.contact-card { padding: 30px; color: var(--text); }
.contact-card p { margin: 0 0 12px; color: var(--text); opacity: 1; }
.contact-card .btn { margin-top: 12px; }
footer { padding: 30px 20px; text-align: center; color: rgba(255,255,255,.74); background: #071428; }
footer p { margin: 4px 0; }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-16px); } }
@media (max-width: 980px) {
  .nav-toggle { display: inline-grid; place-items: center; }
  .nav-links { position: absolute; top: 82px; left: 0; right: 0; display: none; flex-direction: column; align-items: flex-start; padding: 20px; border-radius: 18px; background: rgba(5, 22, 50, .96); }
  .nav-links.open { display: flex; }
  .hero-inner, .assets, .contact { grid-template-columns: 1fr; }
  .stats, .four, .timeline { grid-template-columns: repeat(2, 1fr); }
  .case-grid-two { grid-template-columns: 1fr; max-width: 760px; }
  .hero { min-height: auto; }
  .hero-inner { padding-bottom: 150px; }
}
@media (max-width: 640px) { .digital-twin-stage { min-height: 460px; } .terrain-grid { inset: 140px -30px 30px -10px; } .city-cluster { left: 32px; right: 26px; bottom: 92px; gap: 5px; } .city-cluster i { min-height: 70px; } .card-top, .card-mini { display: none; } .card-main { right: 0; left: 0; bottom: 18px; min-width: 0; padding: 22px; } .card-main strong { font-size: 28px; } .uav-chip { right: 16px; top: 96px; width: 128px; height: 70px; }
  .wrap, .nav { width: min(100% - 28px, 1180px); }
  .brand-hero span { font-size: 64px; letter-spacing: -2px; }
  .brand-hero strong { font-size: 15px; letter-spacing: 4px; }
  .hero-inner { padding-top: 38px; }
  .hero-visual { min-height: 360px; }
  .flight-card, .model-card { position: relative; inset: auto; margin-bottom: 14px; }
  .drone { right: 20px; top: 160px; }
  .blocks { left: 24px; right: 24px; bottom: 30px; }
  .stats, .four, .case-grid, .timeline, .asset-list { grid-template-columns: 1fr; }
  .stats { margin-top: -46px; }
  .section { padding-top: 78px; }
  .case-image { height: 230px; }
  .contact { padding: 30px 22px; }
}